You’ve been urged not to “reply all” unless absolutely necessary. You’ve done it anyway, almost reflexively.
If you worked for the State Department, you could face punishment for this e-mail behavior. Last Saturday, January 10, the Associated Press reported the following:
An overload occurred on State Department systems when when diplomats hit “reply all” to a message mistakenly copied to several thousand global recipients. Some also used less-than-diplomatic language in their notes.
Some also compounded the problem by trying to recall their initial replies, generating yet another round of messages.
From now on, the State Department says use of the “reply to all” button may result in unspecified “disciplinary actions.”
See? Your English teacher was right all along!